Datasheet

LT1129/LT1129-3.3/LT1129-5
8
112935ff
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Output Current Current Limit Current Limit
Reverse Output Current Ripple Rejection Ripple Rejection
INPUT VOLTAGE (V)
0
SHORT-CIRCUIT CURRENT (A)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2
4
5
112935 G23
1
3
6
7
V
OUT
= 0V
TEMPERATURE (°C)
–50
SHORT-CIRCUIT CURRENT (A)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
50
75
112935 G24
–25
25
100
125
V
IN
= 7V
V
OUT
= 0V
OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (μA)
100
90
80
70
60
50
40
30
20
10
0
8
112935 G25
2
4
6
10
13579
T
J
= 25°C, V
IN
= 0V
V
OUT
= V
SENSE
(LT1129-3.3/LT1129-5)
V
OUT
= V
ADJ
(LT1129)
CURRENT FLOWS
INTO DEVICE
LT1129-3.3
LT1129
LT1129-5
TEMPERATURE (°C)
–50
RIPPLE REJECTION (dB)
70
68
66
64
62
60
58
56
0
50
75
112935 G26
–25
25
100
125
(V
IN
– V
OUT
)
AVG
= 1V
V
RIPPLE
= 0.5V
P-P
I
L
= 0.7A
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
100
90
80
70
60
50
40
30
20
10
0
10 1k 10k 1M
112935 G27
100 100k
I
OUT
= 500mA
V
IN
= 6V + 50mV
RMS
RIPPLE
C
OUT
= 47μF
SOLID
TANTALUM
C
OUT
= 3.3μF
SOLID
TANTALUM
TEMPERATURE (°C)
–50
OUTPUT CURRENT (μA)
30
25
20
15
10
5
0
0
50
75
112935 G22
–25
25
100
125
V
IN
= 0V
V
OUT
= V
SENSE
= 5V (LT1129-5)
V
OUT
= V
SENSE
= 3.3V (LT1129-3.3)
V
OUT
= V
ADJ
= 3.75V (LT1129)
LT1129-5
Transient Response
Load Regulation
LT1129-5
Transient Response
TEMPERATURE (°C)
–50
LOAD REGULATION (mV)
0
–5
–10
–15
–20
–25
–30
0
50
75
112935 G28
–25
25
100
125
LT1129*
LT1129-3.3
LT1129-5
V
IN
= V
OUT
(NOMINAL) + 1V
ΔI
LOAD
= 1mA to 700mA
*V
ADJ
= V
OUT
TIME (μs)
0
OUTPUT VOLTAGE
DEVIATION (V)
0.10
0.05
0
–0.05
–0.10
400
112935 G29
50
200
300
500
0.6
0.5
LOAD CURRENT
(A)
100
150
250 350 450
V
IN
= 6V
C
IN
= 3.3μF
C
OUT
= 3.3μF
TIME (ms)
0
OUTPUT VOLTAGE
DEVIATION (V)
0.2
0.1
0
–0.1
–0.2
1.6
112935 G30
0.2
0.8
1.2
2.0
0.7
0.5
0.3
0.1
LOAD CURRENT
(A)
0.4
0.6
1.0 1.4 1.8
V
IN
= 6V
C
IN
= 3.3μF
C
OUT
= 47μF